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Steel for titanium-boron composite micro alloying afterheat treatment steel bar

A technology of micro-alloying and residual heat treatment, which is applied in the field of hot-rolled ribbed steel for reinforced concrete, can solve the problems of high technical requirements, low production efficiency, and large fluctuations in strength and performance of steel bar surface warping defects, and achieves improved performance. Reinforcement strength, reduced performance fluctuations, and the effect of eliminating warping defects

Inactive Publication Date: 2014-04-09
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can further reduce the alloy content of 20MnSi waste heat treated steel bars, save alloy resources and reduce production costs; it can also overcome the shortcomings of high technical requirements for cooling devices, difficult cooling process control, and low production efficiency for Q235 ordinary carbon steel waste heat treated steel bars
However, in the mass production of this kind of steel bars, the probability of surface warping defects of steel bars is high, and the fluctuation of strength performance is large, and sometimes even lower than the standard requirements

Method used

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  • Steel for titanium-boron composite micro alloying afterheat treatment steel bar
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  • Steel for titanium-boron composite micro alloying afterheat treatment steel bar

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Embodiment Construction

[0016] The steel of the present invention is smelted on common steelmaking equipment and continuously poured into billets. Rolling is then carried out on general-purpose steel bar rolling production equipment, waste heat treatment after rolling, rapid surface quenching by cooling device, and then self-tempering using the heat from the core of the steel bar to transfer from the inside to the outside. The steel bars are naturally cooled on the cooling bed, then cut, bundled, and put into storage.

[0017] The composition of each embodiment of the present invention is shown in Table 1, and the production conditions are 50 tons of converter smelting, continuous casting into a 150mm square billet, rolling on a continuous bar rolling mill, waste heat treatment after rolling, and the mechanical properties are shown in Table 2.

[0018] It can be seen that the boron-titanium alloyed rebar after heat treatment has high strength and toughness, R eL ≥600MPa, strong yield ratio R m / R ...

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Abstract

The invention provides steel for a titanium-boron composite micro alloying afterheat treatment steel bar. The steel comprises the following chemical components by weight percent: 0.15-0.25% of C, 0.35-0.80% of Si, 0.60-1.50% of Mn, no more than 0.045% of P, no more than 0.045% of S, 0.0005-0.0035% of B, 0.011-0.022% of Ti, and the balance of Fe and impurity elements. The steel is applicable to production of the afterheat treatment steel bar which is smaller than or equal to phi 50mm; the performance indexes of the produced steel bar are achieved as follows: the yield strength ReL (Rp0.2) is greater than or equal to 600MPa, the yielding-to-tensile ratio Rm / ReL (Rp0.2) is greater than or equal to 1.15, and the total elongation rate Agt under the maximal stress is greater than or equal to 5.0%. The steel also can be used for producing the afterheat treatment steel bar of which the yield strength is 460-550MPa by reducing the cooling strength.

Description

technical field [0001] The invention relates to a steel for hot-rolled ribbed steel bars for reinforced concrete, in particular to a steel for steel bars with boron-titanium composite microalloying waste heat treatment. Background technique [0002] Waste heat treatment steel bar is a kind of high-efficiency and economical steel. Its production process can effectively exert the performance potential of steel. Through the control of various production process parameters, the performance of steel bar can be improved, and the strength of steel bar can be greatly improved. The plasticity and toughness of the steel bar can fully guarantee that the comprehensive performance of the steel bar can meet the requirements. At the same time, the amount of alloying elements is greatly reduced and the production cost is saved. [0003] When producing waste heat treated steel bars, heat treatment is carried out directly on the steel rolling line by utilizing the waste heat of rolling. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14
Inventor 完颜卫国
Owner MAGANG (GROUP) HOLDING CO LTD
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